Free

Active duty personnel and their families can attend more than 1,500 museums nationwide for free today. The Blue Star Families Program is a collaborative effort by National Endowment of the Arts, Blue Star Families, and the Department of Defense to give free museum admission to military families during the summer. Executive Director of the River Discovery Center in Paducah says up to five family members can get in free, and the active duty member doesn’t even need to be present.

Mammoth Cave National Park is offering two free cave tours later this month in recognition of National Park Week.

Visitors must pick up tickets for the free tours of the Discovery and Mammoth Passage caves, which are being given April 21-29. Park Superintendent Patrick Reed says outdoor activities benefitnot only physical and mental health, but "it's just plain fun."